Cyclists who use bike-sharing programs are much less likely to wear helmets than people who ride their own bikes. A team of designers in London has come up with a solution: temporary helmets you can throw away.

Cars and crashes aren't the most dangerous things to bikers. The most dangerous are big trucks, which have little visibility and make wide turns and can be deadly on the road. This new design would make it easier for truck drivers to see bikers, and then not kill them.